Add option to use libfuzzer sys in full_stack_target

Note that there doesn't appear to be a way to conditionally set
 #[no_main] so that has to happen manually at compile-time.

Author: TheBlueMatt

fuzz/Cargo.toml

@@ -13,6 +13,7 @@ cargo-fuzz = true
 [features]
 afl_fuzz = ["afl"]
 honggfuzz_fuzz = ["honggfuzz"]
+libfuzzer_fuzz = ["libfuzzer-sys"]
 
 [dependencies]
 afl = { version = "0.4", optional = true }
@@ -22,6 +23,7 @@ bitcoin_hashes = { git = "https://github.com/TheBlueMatt/bitcoin_hashes", branch
 hex = "0.3"
 honggfuzz = { version = "0.5", optional = true }
 secp256k1 = { version = "0.11", features=["fuzztarget"] }
+libfuzzer-sys = { git = "https://github.com/rust-fuzz/libfuzzer-sys.git", optional = true }
 
 [build-dependencies]
 cc = "1.0"

fuzz/fuzz_targets/full_stack_target.rs

@@ -1,3 +1,6 @@
+//Uncomment this for libfuzzer builds:
+//#![no_main]
+
 extern crate bitcoin;
 extern crate bitcoin_hashes;
 extern crate lightning;
@@ -540,6 +543,14 @@ fn main() {
 	}
 }
 
+#[cfg(feature = "libfuzzer_fuzz")]
+#[macro_use] extern crate libfuzzer_sys;
+#[cfg(feature = "libfuzzer_fuzz")]
+fuzz_target!(|data: &[u8]| {
+	let logger: Arc<Logger> = Arc::new(test_logger::TestLogger{});
+	do_test(data, &logger);
+});
+
 extern crate hex;
 #[cfg(test)]
 mod tests {